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21874 (1999 UB6)
Classification: Main-belt Asteroid          SPK-ID: 2021874
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1100042681191684 3.0391e-08  
a 2.281343347806336 6.7061e-09 au
q 2.030385842502367 7.002e-08 au
i 3.344360087943387 2.9913e-06 deg
node 117.7893389578216 5.835e-05 deg
peri 79.63577957383359 6.006e-05 deg
M 241.7374278611612 1.5609e-05 deg
tp 2459613.955930192480
(2022-Feb-03.45593019)
5.5358e-05 TDB
period 1258.590373753681
3.45
5.5495e-06
1.519e-08
d
yr
n .286034286855634 1.2612e-09 deg/d
Q 2.532300853110306 7.4438e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1943  
   data-arc span      10847 days (29.70 yr)  
   first obs. used      1991-06-07  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51392  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:29  

Additional Information
 Earth MOID = 1.03096 au 
 Jupiter MOID = 2.42479 au 
 T_jup = 3.595 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6   n/a MPO344475  
diameter diameter 3.471 km 0.740 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.212   0.163 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

21874 (1999 UB6)          Discovered 1999-Oct-18 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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